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Note Debt Securities Available for Sale (AFS debt securities in a continuous unrealized loss position) (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Securities, Available-for-sale |  |
Less than 12 months Fair Value | $ 3,396,378 | $ 4,498,383
Less than 12 months Gross Unrealized Losses | 7,003 | 30,555
12 months or more Fair Value | 6,998,793 | 4,651,571
12 months or more Gross Unrealized Losses | 202,304 | 102,530
Total Fair Value | 10,395,171 | 9,149,954
Total Gross Unrealized Losses | 209,307 | 133,085
US Treasury Securities |  |
Debt Securities, Available-for-sale |  |
Less than 12 months Fair Value | 3,189,007 | 2,608,473
Less than 12 months Gross Unrealized Losses | 4,188 | 14,749
12 months or more Fair Value | 2,607,276 | 1,027,066
12 months or more Gross Unrealized Losses | 36,343 | 13,862
Total Fair Value | 5,796,283 | 3,635,539
Total Gross Unrealized Losses | 40,531 | 28,611
Obligations of U.S. Government sponsored entities |  |
Debt Securities, Available-for-sale |  |
Less than 12 months Fair Value | 14,847 | 214,670
Less than 12 months Gross Unrealized Losses | 46 | 1,108
12 months or more Fair Value | 318,271 | 376,807
12 months or more Gross Unrealized Losses | 3,454 | 3,228
Total Fair Value | 333,118 | 591,477
Total Gross Unrealized Losses | 3,500 | 4,336
Obligations of Puerto Rico, States and political subdivisions |  |
Debt Securities, Available-for-sale |  |
Less than 12 months Fair Value | 0 | 6,609
Less than 12 months Gross Unrealized Losses | 0 | 59
12 months or more Fair Value | 6,742 | 0
12 months or more Gross Unrealized Losses | 184 | 0
Total Fair Value | 6,742 | 6,609
Total Gross Unrealized Losses | 184 | 59
Collateralized Mortgage Obligations - Federal agencies |  |
Debt Securities, Available-for-sale |  |
Less than 12 months Fair Value | 66,652 | 153,336
Less than 12 months Gross Unrealized Losses | 489 | 2,110
12 months or more Fair Value | 587,869 | 595,339
12 months or more Gross Unrealized Losses | 27,913 | 24,922
Total Fair Value | 654,521 | 748,675
Total Gross Unrealized Losses | 28,402 | 27,032
Mortgage Backed Securities |  |
Debt Securities, Available-for-sale |  |
Less than 12 months Fair Value | 125,872 | 1,515,295
Less than 12 months Gross Unrealized Losses | 2,280 | 12,529
12 months or more Fair Value | 3,478,635 | 2,652,359
12 months or more Gross Unrealized Losses | 134,410 | 60,518
Total Fair Value | 3,604,507 | 4,167,654
Total Gross Unrealized Losses | $ 136,690 | $ 73,047

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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